Further fixes to bad color handling. Allow main color be represented with arbitrary transparency.

57181.dat (Philo's model of the XL-motor) showcased a new problem.. there was no handling of unknown colors which led into crashes. Added stdout warnings, also added mid and dark stone colors

Restructured inlining to use a proper caching.. one cache per sub-file reference? What was I thinking? *whacks self with a 55295.dat*

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mercurial